开云体育

Thanks for the info! Yes, I have calibrated in the App as well.

Thanks!! But I'm not sure what you mean by generator threshold. Is that the stop point in the calibration?

Only had this for a few days. I don't know how to do any of what you suggested.
Connectors are tight. I didn't use cables with this calibration. I followed the guy in the video. I agree this does not look like the guy in the video outcome. he didn't have the lines extruding form the points.

Here my generator:
As can see my device allow work up to ? 306M, but i leave default 300M
Your device can be near 290M (some device 280M)

Generator threshold value must be less then default 300M, need more detail see work in range 270 - 300M (reset calibration and see in this range)
From there threshold start problem.

After write it to CONFIG->EXPERT SETTING->THRESHOLD
After need save CONFIG->SAVE CONFIG

Here at the pics. The green lines are moving.

You have no trace information or markers displayed. See the orange box below to see what I mean.

If you did a software update you might need to do a Clear Config to flush out the old settings. It is under the expert settings and if you need a password it is 1234

Roger

On Tue, Aug 30, 2022 at 11:50 AM, TE Dukes wrote:

Here at the pics. The green lines are moving.

I have a hunch it might be the harmonic mode that is having problems. Try calibrating from 50 kHz. to 200 MHz and see if it improves.

Roger

try to do your sweeps with some averaging (means more points/values per measure point are takern and interpolated) ... that make the curves more even

you even can do the calib with high avg .. and measure then with lower avg (on none at all)

are your connectors tight?? what cable do you use?? are those values jumping around if you move cables a bit (wiggle on them)???

that you have those waves at the lower end and straight lines on the rest of the scan is not normal

dg9bfc sigi

Am 30.08.2022 um 19:11 schrieb TE Dukes:

HA!! Didn't know I could do that!!

Here at the pics. The green lines are moving.

Thanks!!

why not use w10?? ... most if not all software for w7 should also work on w10

dg9bfc sigi

Am 30.08.2022 um 19:39 schrieb Leif M:

You can take screenshots using nanoVNA app by just connecting to your nanoVNA and clicking the camera button.

Roger

I still use W7 because most of my software is there. Nano VNA software for W7 would be nice too.

On Tue, Aug 30, 2022 at 10:11 AM, TE Dukes wrote:

Anyway, the points are where they are supposed to be BUT I have green lines
coming out of each point jumping around. Pretty sure its not supposed to be
doing that.

Here are some screenshots of short, open and load after calibration. Post yours for comparison

Roger

Right, the frequency range is a little wider than the range/points I want to check. Range is 460Mhz to 470Mhz and I want to check 462.550Mhz and 467.550Mhz.

Thanks

Thanks!!

I watched the video and did the calibration along with the guy. My menus are a little different than his. I don't have the choice of 'CORRECTION'. I think the equivalent on mine is 'Apply".

Anyway, the points are where they are supposed to be BUT I have green lines coming out of each point jumping around. Pretty sure its not supposed to be doing that.

Any ideas?

Thanks

On 8/29/22 6:40 PM, TE Dukes wrote:

What I'm wanting to do is to check a dupexler I have coming in the next week or so to make sure its tuned close the frequencies I requested.
I know this is not the ideal way to do it but I don't have $12K for a Tektronic VNA.
Attached are the pics.
Thanks, really appreciate the help!!

My first guess is that the frequency range used for calibration is different than the frequency range used for the measurement.

I suggest you use the nanoVNA in stand-alone mode (without a PC) in order to test it out.
Do a calibration over a wide range like 50 kHz. to 900 MHz. and then check it using the cal loads and the Smith Chart.
Short should be a dot on far left of horizontal axis
50 ohm load should be a dot in center of Smith chart
Open should be a dot on far right of horizontal axis

Watch this video for the complete procedure.

Roger

I know about several problems in 450-480MHz range.
Try calibrate in 300-600MHz, but measure in 460-470MHz

PS on screenshot i see you use NanoVNA-App calibration mode (so you calibrate in it?)

Actually I started with Slackware 1.0 but moved to RH 2.0. Been a long time ago, my memory may be off on the date.

Yes, I re-did the calibration on nanovna itself as well as in the App.